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Eriogonum umbellatum var. dichrocephalum
BICOLOR SULPHUR FLOWER

Higher Taxonomy
Family: PolygonaceaeView DescriptionDichotomous Key

Common Name: BUCKWHEAT FAMILY
Habit: Annual to shrub [tree]. Stem: nodes swollen or not. Leaf: simple, basal or cauline, generally alternate; ocreae present or 0, generally scarious, persistent or not. Inflorescence: flower clusters in axillary to terminal cyme-, panicle-, raceme-, spike-, umbel- or head-like arrangements, entire inflorescence or main inflorescence branches generally subtended by bracts ("inflorescence bracts"); peduncles present or 0; flower clusters in Eriogoneae-Eriogonoideae subtended by involucre of >= 1 free or +- fused, sometimes awn-tipped bracts ("involucre bracts") or, in Polygonoideae and rarely in Eriogonoideae, not (if bracts completely fused, involucre "tubular"); pedicels in Eriogoneae each often subtended by 2 free, transparent, linear bractlets or in Polygonoideae all subtended by 2+ fused, membranous, wide bractlets. Flower: generally bisexual, small, 1--200 per node; perianth parts 2--6, generally in 2 whorls, free or basally fused, generally petal-like, often +- concave adaxially, often darker at midvein, often turning +- red or +- brown in age; stamens [1]3 or 6--9 in 2 whorls; ovary superior, 1-chambered, ovule 1, styles 1--3. Fruit: achenes, included in or exserted from perianth, generally 3-angled, ovoid or elliptic, generally glabrous.
Genera In Family: 48 genera, +- 1200 species: worldwide, especially northern temperate; some cultivated for food (Coccoloba, sea-grape; Fagopyrum, Rheum, Rumex) or ornamental (Antigonon, lovechain; Coccoloba; Muehlenbeckia; Persicaria; Polygonum), a few timbered (Coccoloba; Triplaris). Several (Emex; Fallopia; Persicaria; Polygonum; Rumex) are weeds. Note: Treatment of genera in Eriogonoideae based on monographic work of James L. Reveal. Involucre number throughout is number (1--many) per ultimate grouping, at tips of ultimate branches; flower number is per flower cluster or involucre, unless otherwise stated. Fagopyrum esculentum Moench not naturalized, considered an historical waif (or garden weed +- presently), therefore not treated.
eFlora Treatment Author: Mihai Costea, except as noted
Genus: EriogonumView DescriptionDichotomous Key

Common Name: WILD BUCKWHEAT
Habit: Annual to shrub, matted or not. Stem: prostrate to erect, occasionally 0, glabrous or hairy, occasionally glandular. Leaf: basal, sheathing (on stem above basal, beneath other, +- non-sheathing cauline), or cauline, alternate, opposite, or whorled; blades linear to +- round, generally longer than wide, margins flat, wavy, or rolled under; ocreae 0. Inflorescence: variable, glabrous or hairy, occasionally glandular; peduncles 0 or erect to reflexed (pointed down); involucres 1 or in clusters, tubular, glabrous or hairy, teeth generally 4--10, awns 0. Flower: (2)6--100(200), with a stalk-like base ("flower stipe" or "stipe") or not; perianth generally white to red or yellow, glabrous or hairy, occasionally glandular, lobes 6, generally entire; stamens 9. Fruit: generally brown or black, generally obconic, glabrous or hairy; embryo curved or straight.
Species In Genus: +- 250 species: temperate North America. Etymology: (Greek: woolly knees, for hairy nodes of 1st sp. named) Note: One of largest genera in California; stem in descriptions refers to the main stem(s), not branches of inflorescence. A perennial herb allied to Eriogonum austrinum (S. Stokes) Reveal and Eriogonum moranii Reveal of east-central Baja California, with spreading (rather than reflexed or erect) involucres on peduncles < 2 mm, occurring in DMtns (Bristol, Granite mountains), has been known for nearly 25 years yet remains undescribed. Eriogonum puberulum moved to Johanneshowellia.
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
Species: Eriogonum umbellatumView Description 

Common Name: SULPHUR FLOWER
Habit: Perennial herb to shrub, (0.2)1--12(20) dm, (0.5)1--12(20) dm diam. Stem: (0.1)0.5--3(4) dm, tomentose to hairy or glabrous. Leaf: basal; blades 0.3--3(4) cm, 0.1--2.5 cm wide, tomentose or glabrous. Inflorescence: umbel-like (main branches of 1 order) or compound umbel-like (main branches of >= 2 orders), rarely head-like, 3--25 cm, 2--18 cm wide; branches tomentose to hairy or glabrous, rarely with bracts near middle of branches; involucres 1--6 mm, (1)1.5--10 mm wide, tomentose to hairy or glabrous; teeth 6--12, reflexed. Flower: 2--10(12) mm, stipe (0.7)1.3--2 mm, glabrous; perianth white, yellow or red, lobes generally spoon-shaped to obovate. Fruit: 2--7 mm, glabrous except sparsely hairy tip.
Note: Highly variable; many varieties outside California, to western Canada, Montana, Colorado, Arizona.

Eriogonum umbellatum var. dichrocephalum Gand.
NATIVE
Habit: Mat 5--10 dm diam. Stem: (0.5)1--2.5 dm, tomentose to hairy (or glabrous). Leaf: blades 1--2(2.5) cm, 0.5--1.5(2) cm wide, tomentose to hairy abaxially, tomentose or glabrous adaxially. Inflorescence: main branches of 1 order, tomentose; involucre tubes 2--3 mm, teeth 1--2.5 mm. Flower: 4--8 mm; perianth pale yellow to cream or +- white (or green-white).
Ecology: Sand to gravel; Elevation: (1200)1400--3100 m. Bioregional Distribution: Wrn, W&I; Distribution Outside California: to eastern Oregon, southwestern Montana, northern Utah. Flowering Time: Jun--Sep
Synonyms: Eriogonum aridum Greene; Eriogonum umbellatum subsp. aridum (Greene) S. Stokes; Eriogonum umbellatum var. aridum (Greene) S. Stokes; Eriogonum latum Small ex Rydb.; Eriogonum subalpinum Greene var. arachnoideum Gand.
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
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Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2016. Eriogonum umbellatum var. dichrocephalum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=58762, accessed on May 02, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 02, 2016.


Eriogonum umbellatum var. dichrocephalum
click for enlargement
© 2013 Gary A. Monroe
Eriogonum umbellatum var. dichrocephalum
click for enlargement
© 2011 Aaron E. Sims
Eriogonum umbellatum var. dichrocephalum
click for enlargement
© 2013 Gary A. Monroe
Eriogonum umbellatum var. dichrocephalum
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© 2010 Steve Matson
Eriogonum umbellatum var. dichrocephalum
click for enlargement
© 2002 Gary A. Monroe
Eriogonum umbellatum var. dichrocephalum
click for enlargement
© 2013 Gary A. Monroe

More photos of Eriogonum umbellatum var. dichrocephalum in CalPhotos


Geographic subdivisions for Eriogonum umbellatum var. dichrocephalum:
Wrn, W&I;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.